Low cycle fatigue properties of 8Cr–2WVTa ferritic steel at elevated temperatures

Ishii, Toshiaki; Fukaya, K.; Nishiyama, Yutaka; Suzuki, Masahide; Eto, Minoru

doi:10.1016/s0022-3115(98)00183-4

Cited by 41 publications

(20 citation statements)

References 10 publications

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“…[27,29,30] Kocks et al [31] and Kocks [32] identified A and B as two strengthening factors associated with two distinct types of obstacles, which can be broadly defined as forest dislocations and particles, respectively. The term A is the dislocation strengthening d , and B includes all other components of the yield strength: [5] where i is Peierls stress, C , solid solution strengthening due to interstitial elements carbon and nitrogen; SS , strengthening from substitutional elements; lb , grain boundary strengthening; P , precipitation hardening; and wh , work hardening. The details of calculation and models as well as the results of values of these components are listed in the work of Li.…”

Section: B Precipitate Hardening Pmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Fe 2 W Laves phase is an important intermetallic component, which can significantly influence microstructures and microstructural stability as well as mechanical properties. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Conventionally, Fe 2 W Laves phase is often considered detrimental for steels since it reduces their toughness. [2][3][4][5][6] Kunimitsu et al [2] observed a decrease in toughness after Fe 2 W Laves phase precipitated in a 9Cr-2W steel.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Conventionally, Fe 2 W Laves phase is often considered detrimental for steels since it reduces their toughness. [2][3][4][5][6] Kunimitsu et al [2] observed a decrease in toughness after Fe 2 W Laves phase precipitated in a 9Cr-2W steel. Schafer [3] showed that precipitation of Laves phase embrittles a 8Cr-2W steel.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental result of the work of Tamura et al [4] indicates that Fe 2 W Laves phase increases the fracture appearance transition temperature for a 8Cr-2WVTa steel. Ishii et al [5] correlated the large softening phenomenon in a 8Cr-2WVTa steel with Fe 2 W Laves phase precipitation during low-cycle fatigue tests at 600 °C. Fernandez et al [6] also showed that significant degradation of impact properties is directly linked to Fe 2 W Laves precipitates.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

2006

Metall Mater Trans A

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Precipitation of Fe 2 W Laves phase in a 12Cr-2W power plant steel is investigated by using transmission electron microscopy (TEM). Fe 2 W Laves phase is found to be coherent with the matrix and has a stacking fault structure. The influence of formation of Fe 2 W Laves phase on the yield strength of the steel is quantitatively evaluated. The modeling result indicates that the strengthening effect from the formation of Laves phase particles is diminished by the loss of solid solution strengthening of alloying elements, and, as a result, the strength of the steel remains similar. The effect of clustering and coarsening of Laves precipitates on the strength of the steel is also studied. It is showed that clustering and coarsening decreases the strengthening effect of Laves phase. The limitation of the modeling approach currently adopted is also discussed.

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Section: B Precipitate Hardening Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

2006

Metall Mater Trans A

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“…During operation, first wall structural materials are subjected to cyclic mechanical stress at high temperatures and cyclic thermal stress caused by temperature change. Cyclic straining process in RAF/M steels to softening at elevated temperature [5,6]. From the viewpoint of fatigue mechanism, temperature is one of the important external parameters influencing fatigue life, because fatigue is conditioned by generally temperature dependent cyclic plastic deformation [7].…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue behavior of JLF-1 steel at elevated temperatures

Nishimura

et al. 2006

Fusion Engineering and Design

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On the Cyclic Softening Mechanisms of Reduced Activity Ferritic/Martensitic Steels

Giordana

Alvarez‐Armas

Armas

2012

steel research int.

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Low‐cycle fatigue tests were performed in three different ferrite/martensite steels, i.e., the European RAFM steel EUROFER 97 and the commercials AISI 410 and AISI 420, at room temperature (RT) and at 550°C. After the first few cycles, a cyclic softening that continues up to failure is observed for all these steels. The cyclic softening exhibited by AISI 420 is less pronounced than for the other two steels. The comparison between the mechanical responses of the materials was based on the study of the flow stress components, i.e., the friction and the back stresses, and their correlation with the microstructure evolution. In most cases, the strong cyclic softening observed is produced by the decreasing stress values exhibited by both stress components. However, at RT, for AISI 420, the back stress does not present variation during cycling. The decrease of the free dislocation density inside the subgrains and the growth of the mean subgrain size represent the main microstructural evolution.

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Low cycle fatigue properties of 8Cr–2WVTa ferritic steel at elevated temperatures

Cited by 41 publications

References 10 publications

Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

Precipitation of Fe2W laves phase and modeling of its direct influence on the strength of a 12Cr-2W steel

Low cycle fatigue behavior of JLF-1 steel at elevated temperatures

On the Cyclic Softening Mechanisms of Reduced Activity Ferritic/Martensitic Steels

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